Textile printing process and composition



"" and cellulose itself in Patented Nov. 20, 193 4 UNITED STA TEXTILEPRINTING PROCESS AND COMPOSITION No Drawing.

Application March 19, 1932,

Serial No. 600,070. In Great Britain March 19, 1931 Claims.

This invention relates to the printing of textile materials, and moreparticularly refers to improvements in the printing of textile materialsconsisting of or containing both cellulose esters the form of eithercotton or regenerated cellulose'silk.

Dyestuffs of the direct dyeing azo group, also known as salt dyestuffs,may be applied to cotton or regenerated cellulose silk in the form ofan0,1- dinary printingpaste, as is well known. It is further known thatwhen they are so applied to cellulose esters no coloration, or at themost a mere staining, is produced; although a good coloration may beobtained on cellulose esters when the printing paste contains alkali.However, a sufliciently alkaline printing paste cannot be applied tocotton or regenerated cellulose silk because, in consequence mostprobably of interaction of the alkali with the cellulose, the azodyestuff is reduced and a weak shade or a mere staining,sometimes of anobjectionable hue, is obtained.

It will thus be seen that dyestuffs of the direct dyeing azo group couldnot be satisfactorily used I for printing textile materials consistingof or containing both cellulose esters and cellulose itself in solid anduniform shades.

This invention has for an object the printing of textile materialsconsisting of or containing both cellulose esters and cellulose itself,the latter being present in the form of cotton or regenerated eellulosesilk or a mixture of the two, in solid and uniform shades. Furtherobjects will appear hereinafter.

These objects are attained by applying to the above mentioned textilematerials a printing paste containing a direct dyeing dyestuif of theazo group and an alkali, the printing being effected in the presence ofa soluble aromatic nitro compound. 1

The term soluble aromatic nitro compound is intended here to denote abenzene, toluene, naphthalene, or the like derivative containing 9.nitro group and a group such as sulphoor carboxy-, capable of renderingthe compound soluble in water or aqueous alkali. Naturally, the solublearomatic nitro compound will preferably be not itself-colored.

. The invention will be further understood by a consideration of thefollowing examples.

, Example I One (1) part of Chlorazol dark green PL (Color Index No.583) was dissolved in 9 parts of water and '70 parts of Britishgum'thickening 30%, 6

parts of the sodium salt of m-nitrobenzene sul- TES' PATENT OFFICE;

phonic acid and 14 parts of caustic soda'solution 90 Tw., to a unionfabric consisting were added, This paste was printed on-.-

of cellulose acetate and viscose silk, and the fabric, after drying, was

steamed for %-1 hour with'moist steam at 100 C. and flnally washed inwater to remove the thickening agent. A solid uniform green shadeterial.

Example II I was produced on the printing portions of themaand viscose'silk was padded in a 2% aqueoussolution of sodiumm-nitrobenzene-sulphonate,

dried, and printed with a paste composed as follows: One (1) part ofChlorazol green BN (Color Index No; 593) dissolved in 12 parts of water,to which were added '13 parts of British gum thickening 30%, and 14parts of caustic soda solution: Tw. The printing material was thensteamed and finished as the first example.

described in In carrying the invention into practical effectconsiderable variation in procedure and mate rials is permissible aswill be obviousfrom the above examples and. description. There may. beadded to a printing paste containing a direct dyeing dyestufi of the azogroup a suitable proportion (preferably from 540%) of an alkali andsodium m'-nitrobenzene sulphonate. The

resulting paste isapplied to the textile material in the customarymanner.

Similar results were obtained when in place of Chlorazol dark green PLthe following direct dyeing azo compounds were used:Chlorazol sky blueFF (Color Index No. 518), Chlorazol fast pink BK (Color Indexv No. 353),Chrysophemine- G (Color Index No. 365).

In the above examples m-nitrobenzene sulphonic acid was used, but verysatisfactory resuits may also be obtained by using m-nitrobenzoic acid,1-nitro-naphthalene-6- or 7-sulphonic acid,

or l-chloro-4-nitrobenzene-2-sulphonic ,acid.

In addition to the advantages above described the soluble aromatic nitrocompounds disclosed herein may also be used as resist salts. By means ofthis invention uniform solid shades are produced.

As many apparently widely different embodiments of this invention may bemade without departing from the spirit and scope thereof, it

is to be understood that we do not limit ourselves to the specificembodiments thereof except as defined in the appended claims.-

cellulose'.itself 5 wherein the.

comprising a presence of a nonnitro compoun -bine with the materialcontainin wherein the materi 1. A process for 2. A process for producingprinted shades on ining both cellulose esters and in regenerated ornatural form material is printed with a paste direct azo dye and analkali in the dyeing water-soluble aromatic d, which compound does'notcomdirect azo dye. producing printed shades on g both cellulose estersand regenerated or natural form printed with a paste dye, an alkali anda itro compound of thewhich compound in itself and does dye.

3. A process for producing solid printed shades 4. A process forwatersolubie arom sequently printe rect azo dye an 6. A composition of rectazo dye, matic nitro c I thalene series 5 and doesnot ,7. A compositiondirect azo dyestuif,

on material containingboth cellulose esters and cellulose itself inregenerated wherein the material is printed taining a direct azodyestuff sodium in or natural form with a paste conan alkali, and

-nitrobenzene sulphonate.

producing Printed shades on g both cellulose esters and cellu 'se itselfin regenerated or natural form al is padded with a non-dyeing aticpitro'compoundand subd with a paste comprising adid an alkali, whicharomatic nitro' unddoes not combine with the direct azo solid printedshades ,cellulose esters and" d or natural form with sodium m andprinted with dyestuif and an matter comprising 5 dian alkali and awater-soluble aro-' ompound of the benzene or naphwhich compound is nota .dyestuil'v azo combine with the direct azo dye. Chlorazol dark ofmattercomprising a an alkali, and sodium mnitrobenzene sulphonate.

8. The process 0 ompi'ising printing a "union fabric. comprisingcellulose acetate and viscose silk, with a caustic soda .solutio thusprinted being dried, 1 hour with moist steam finally washed in water.

14 parts of at about 100 0., and

steamed for about '%-11 9.. The process wherein a "union fabric,comprising cellulose acetate and viscose silk, is padded in about a 2%aqueous solution of sodium m-nitrobenzene sulphonate. dried, and printedwith a paste composed of about 1 part Chlorazol green BN (Color Index'No. 593) dissolved in about 12 parts of water to which is added about I73 parts of British gum thickening agent about 30% and about 14 parts ofcaustic soda solution about Tw.-, the material thus printed being dried,steamed for about V -l hour with. moist steam at aboiit 0., and finallywashed in water. i r 10. A process for printing'material containing bothcellulose esters and cellulose itself in regenerated or natural formwherein the material is printed with a paste comprising a directazocolor selected from the group consisting of Chlorazol dark green PL,Chlorazol green BN, Chlorazol sky blue FF, Chlorazol fastpink BK, andChrysophemine G, an alkali, and ;a soluble aromatic nitro compoundselected from the group consist-i ing of m-nitrobenzene-sulionic acid,m-nitrobenzoicacid, 1-nitro-naphthalene-6- or 'I-sulfonic acid, andl-chloro 4 acid.

11. The process of claim 10 wherein. the mate rial is first padded withthe soluble aromatic nitro compound and then printed with the pastecomprising thedirect azo color and an alkali.

12. A process for printing material containing 1 both cellulose estersand cellulose itself inregenerated or natural form green PL, causticsoda, sulfonic acid. 13. A process for printing material containingbothcellulose esters and cellulose itself in'regenerated or natural formwherein the material is .padded with m-nitrobenzene-sulfonic acid,.and

subsequently printed with a Chlorazol green EN, 14. A composition pastecomprising. and caustic soda.

of matter comprising-a direct color selected from the group consistingof 15. A composition of matter comprising Chlorazol dark green PL.caustic soda, and m-nitrobemzene-suli'onic acid.

manna-r BRADLEY ierces.- RICHARD WALTER. HARDACRE.

nitrobenzene-2-su1fonic 100

